海南岛文昌现代红色沙质土壤的主量元素分析结果与意义

Major element analysis results and significance of modern red sandy soil in Wenchang,Hainan Island

对海南岛东北部文昌坑尾园风成砂物质基础上发育的现代“红色沙壤”中SiO_(2)、Al_(2)O_(3)、TOFE、CaO、Na_(2)O、K_(2)O、MgO这7种主量元素的研究发现:现代红色沙壤土中SiO_(2)含量最高,MgO含量最低;CIA分别与Saf和ba存在负相关关系且剖面上下部数据变化符合土壤自剖面底到顶风化程度变弱的规律;坑尾园剖面高CIA值,与该地所处的热湿环境相关。在此环境下,水土流失带来元素迁移,使得除SiO_(2)外的6种元素值均因减少而处于低值状态。

Through the study of seven elements-SiO_(2)、Al_(2)O_(3)、TOFE、CaO、Na_(2)O、K_(2)O、MgO in the modern“red sandy soil”developed on the basis of eolian sand in Wenchang Kengwei Garden in the northeast of Hainan Island,the study found that the content of SiO_(2) is the highest and the content of MgO is the lowest in modern red sandy loam.CIA is negatively correlated with Saf and ba,respectively,and the variation of the data in the upper and lower part of the profile is consistent with the weakening of the soil weathering from the bottom to the top of the profile.The high CIA value of Kengwei Garden profile is related to the thermal and humid environment.In this context,soil and water loss cause the loss of elements,so that all the elements except SiO_(2) are in deficit state.